Hemstitch sewing-machine.



PATEN-TED' MAE. s1, 1903. l c. M. ABERCROMBIE. EEMSTITGE SEWING MACHINE.

APPLICATION FILED APB. 24, 1902. l Eo MODEL. Y z SHEETS-SHEET 1.-

` Arron/ver HBMSTIIGH SEWING MACHINE.

APPLIQATION FILED APB. 24, 1902. No MODEL. .A 2sHBnTs-sHBBT2- fflllllllllllll UNITED jSTATES PATENT OFFICE.

CHARLES MACKENZIE ABERCROMBIE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TOdo WILSON MANUFACTURING COMPANY, OF BRIDGEPORT, CONNECTICUT,` ACORPORATION OF CONNECTICUT.

H EM sTiTol-lv SEWING-MACHiN E.

SPECIFICATION forming part of Letters Patent No. 724,233, dated March31, 1903.

Application filed April 24, 1902.

.To all whom it may concern:

Be it known that I, CHARLES MACKENZIE ABERCROMBIE, a citizen of theUnited States,

residing at Bridgeport, in the county of Fairield and State ofConnecticut, have invented a certain new and useful Improvement inHemstitch Sewing-Machines, of which the following is a full, clear, andexact description.

This invention relates more particularly to that class ofsewing-machines for hemstitching fabrics wherein two forward feedmovements of the material alternate with one backward feed movement, theneedle being vertically actuated after each feed movement and havinglateral movements timed alternately to place two stitches'o of the foldor hem and one on, as common in the formation of a hemstitch-seam. l

The object of the invention is to combine a piercer with the needle andactuate the two simultaneously, while retaining the independentoscillating motion ofv the needle, thereby dispensing with anindependent piercer-bar. Y

In carrying out the invention there is em'- ployed avertically-reciprocating needle-bar to which in addition is imparted anoscillating movement, the .'said needle-bar having applied to it atubular bar, to which the piercer is attached, the said piercer-carryingbar partaking of the reciprocating motion of the needle-bar, but withoutreceiving its oscillating motion. The piercer is adjustable, so as tobring it in proper relation and alinement with the needle, all as willbehereinafter more particularly set forth and finally claimed.

In the accompanying drawings, illustrating the invention, in the severalfigures of which like parts are similarly designated, Figure 1 is afront elevation of a Wheeler it Wilson vertical-hook machine, theface-plate being removed and the arm in partial vertical section. Fig.'2is a perspective view of the needle-bar and piercer-bar disassembled.Fig. 3 is a perspectiveview of the cap-plate for the needle-bar. Fig; 4iis a perspective view of a ball-and-socket connection in theneedle-oscillating mechanism, the parts being disassembled. Fig. 5 is aperspective view of the advor trembling of the needle-bar. end of thesleeve 9 is provided with a shouldered head 1 1, which rests upon thetop of Serial No. 104,543. (No model.)

justable piercer-holder, the parts being disassembled. Fig. 6 is abottom plan view of the piercer-holder and the tubular bar to which itis attached.

Parts herein shown and not particularly desdribed may be of the usual orany approved construction, it being understood, as already indicated,that the material-feed mechanism is capable of imparting two forwardfeed movements of the material alternately with V.one backward feedmovement. 1 is the bed-plate, and 2 the arm rising therefrom andcontaining in its upper hori- Azontal portion the usual needle-actuatingshaft 3,-on the forward end of which is any usual orapprovedmotion-transmitting device 4, suchas va cam, crank, or disk.

5 is the needle-bar, the upper end of which l is providedgwith avspline6, having tubular collars 7 at opposite ends fitted to the needlebar andsecured thereto by means of screws 8.

.in the upper end of the arm 2, and within said sleeve is arranged thespline 6,said spline working within the slot 10 and its collar 7 fittingthe bore of the sleeve with sufficient accuracy to prevent undue lateralvibration The upper the adjacentJ portion of the arm 2, and in order toprevent longitudinal movement of this sleeve and at the same time permitthe axial movement thereof there is placed over said shouldered head acap-plate 12, which is re- -cessed at-13, (see Fig. 3,) and this recesshas a lateral opening 14. The cap-plate is secured tothe overhanging armby means of -screws or other fastening devices passed V end of theneedle-bar by a set-screw 26 or any other convenient device, and thisneedleholder also serves the purposes of a collar, as will now appear.

A tubular bar 27 is applied to the lower end of the needle-bar 5 betweenthe lower collar 7 of the spline 6 and the needle-holder 25, and by thiscollar and the said needle-holder the tubular bar 27 is held inposition. This tubular bar is provided at its upper end with apinch-clamp 28, having a laterally-projecting pin 29, which is engagedby a link 30, connected with the device 4 for imparting verticalreciprocating motion to the said tubular bar, which motion, as will beunderstood, is transmitted to the needle-bar. The lower end of thistubular bar is provided with a pinch-collar 31, from which depends anal'rn 32, the face of which is provided with a transverse groove 33,pierced by a slot 34. 35 is the piercer-holder, having a transverse rib36, adapted to fit adjustably in the groove 33 and secured in itsadjustment by means of a setscrew 37, passed through the slot 34 andinto the holder 35, so that the said holder may be adjusted laterallywith relation to its supporting-arm 32. 38 is the piercer,having theright-angle bend 30 and adapted to be inserted in the holder 35 andsecured therein by means of a set-screw 40 in such way that the piercermay be adjusted axially, as indicated by dotted lines in Fig. 6, andsince the piercer is made with the bend 39 it is herein referred to as acranked piercer.

A further and important feature of adjustment of which my constructionis capable is the movement of the piercer in an arc of a circle havingthe needle-bar as its center. Independently of the adjustment of thepiercer toward and from the needle in the line of the seam said pierceris also adjustable transversely of the seam by rotating the pinch-collar31 upon the tubular bar, and the effect of this transverse adjustment isto cause the piercer to descend at any desired point with relation tothe fold without interfering with the adjustment of the piercer in theline of the seam. In other words, the two adjustments of the piercer maybe effected quite independently of one another, and this is a conditionwhich is impossible in those constructions where the piercer-holder isadj ustably supported independently of the needle-bar and out ofsubstantial concentricity therewith.

While it is desirable to have the piercer itself axially adjustable inorder to increase y16 and held in adjusted position therein by means ofa set-nut 42. The end of this bolt is provided with a spherical head 43,and in order to provide a universal joint the link 17 may have its outerend provided with a socket member 44, the complemental socket meinber 45being attachable by screws or otherwise to the socket member 44 .withthe head 43 of the screw-bolt between.

From the foregoing it will be clear that as the movement of the cam 2lis transmitted to the sleeve 9 the latter will cause the needlebar tooscillate axially without interfering with the Vertical reciprocat-ionof said bar, the extent and time of such oscillation being primarilygoverned by the profile of said cam and a slight Variation in the extentof such oscillation being permissable by adjusting the screw-bolt 41.

By constructing the piercer and its holder as described the piercer iscapable of two distinct adjustments in order to maintain the properrelative position of piercer and needle. The distance between the needleand the piercer must equal a multiple of the length of stitch or feedmovement employed, and when the latter is changed the position of thepiercer must be made to correspond therewith, and this may beaccomplished by loosening the piercer set-screw 40 and turning thepiercer axially, as indicated by dotted lines in Fig. 6, until its pointis the proper distance in advance of the needle, after which theset-screw is tightened and the piercerholder is shifted laterallythrough the inedium of the set-screw 37 until the point of the piercerisin proper alinement with the needle.

The construction herein shown and described as applicable to a Wheelerdu Wilson vertical-hook machine is susceptible of structural changes aswell for that machine as for others, and what is herein shown anddescribed is illustrative only of one and the present preferred form ofthe invention.

1. In a sewing-machine of the class described, a needle-bar and needle,combined with a piercer-carrier comprising essentially a piercer-holderadjustable in the line of feed, and a holder-support connected with theneedle-bar and adjustable circularly thereon independently of thefeed-line adjustment.

2. In a sewing-machine,a reciprocating and oscillating needle-bar, aneedle, a piercer, a holder for said piercer having means to adjust saidpiercer toward and from the needle in the line of feed, and a supportfor said holder mounted upon the needle-bar and adj ustableconcentrically thereon.

3. In a sewing-machine of the class de- IOO IOS

IIO

scribed, a piercer, a holder therefor having means to adjust the pierceraxially and means to adjust it laterally with relation to the needle,and a tubular bar by which the piercer-holder is carried, combined witha needle, a needle-bar upon which the tubular bar'is mounted, anon-oscillating connection for the tubular bar with the needle-bar, andmeans for con jointly reciproeati n g the needlebar and tubular bar.

4. In a sewing-machine, a needle-bar, a needle, an oscillating mechanismconnected With said needle-bar, a tubular bar applied to saidneedle-bar, a piercer, a piercer-holder adjustably secured to saidtubular bar, and means connected with the tubular har for impartingvertical reciprocation to the tubular bar and through it to theneedle-bar, said piercer-holder capable of adjustment in the line of theseam independent of its adjustment on the tubular bar.

.my hand this 23d day of April, A. D. 1902.

CHARLES M ACK ENZIE ABERCROMBIE.

Witnesses:

F. W. OsTRoM, C. N. WORTHEN.

